CVE-2018-21247: canonical ubuntu_linux Missing Initialization of Resource
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2018-21247DEBIAN-CVE-2018-21247
Published 17-06-2020Last modified 05-08-2024
Vulnerability summary
CVE-2018-21247 is a high (CVSS 7.5) Missing Initialization of Resource vulnerability in canonical ubuntu_linux. EPSS estimates a 2.46% chance of exploitation in the next 30 days, higher than 84.1% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
2.46%
0%100%
Low · +0.10 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 17-06-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
2.46%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
+0.10 pp
From 2.36% on 18-09-2026
18-09-202618-10-2026
EPSS score2.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Siemens6 products
- simatic_itc1500_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1500_pro_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1900_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1900_pro_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc2200_firmware≥ 3.0.0.0, < 3.2.1.0
Ubuntu3 products
- libvncserverAll versions (No fix recorded)
- veyonAll versions (No fix recorded)
- x11vncAll versions (No fix recorded)
Debian2 products
- libvncserver< 0.9.11+dfsg-1.2
- debian_linuxEOL8.0 | 9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Libvnc_project1 product
- libvncserver≤ 0.9.12
Opensuse1 product
- leapEOL15.2
6 vendors · 14 products
References
11 links- github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13X Refsource MISCPatchThird Party AdvisoryREPORT
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
